1.

If radii of director circle of the ellipse (x^(2))/(a^(2))+(y^(2))/(b^(2))=1 and hyperbola (x^(2))/(a^(2))-(y^(2))/(b^(2))=1 are in the ratio 1:3 and 4e_(1)^(2)-e_(2)^(2)=lambda, where e_1 and e_2 are the eccetricities of ellipse and hyperbola respectively, then the value of lambda is

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ANSWER :`(7)`


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